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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsMedium
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How many (4)-digit numbers can be formed from (0,1,2,5,7,8) without repetition?

Answer and explanation

Correct answer: (300)

The thousands place cannot be (0), so (5\cdot5\cdot4\cdot3=300). In exams, first choose the non-zero leading digit.

Related tags

PermutationsDigitsZero RestrictionPermutations And CombinationsMathematicsClass 11 Mcq
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